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TT: Fachverband Tiefe Temperaturen

TT 5: Frustrated Magnets - General 1 (joint session TT/MA)

TT 5.5: Vortrag

Montag, 16. März 2020, 10:30–10:45, HSZ 304

Orientation dependence of the magnetic phase diagram of Gd₂Ga₅O₁₂ — •Markus Kleinhans, Christopher Duvinage, and Christian Pfleiderer — Physik-Department, Technische Universität München, D-85748 Garching, Germany

The magnetic properties of Gd₂Ga₅O₁₂ (GGG) originate in large, classical spins (J = S = 7/2) that interact antiferromagnetically on two interpenetrating hyperkagome lattices. It has long been recognized that this implies, on a classical level, a high degree of frustration with some kind of classical spin liquid at low temperatures. Yet, dipolar interactions are large and may normally be expected to relieve the effects of geometric frustration. Therefore, it has been considered surprising that GGG at zero magnetic field exhibits spin-freezing without evidence for long-range order, where the recent observation of antiferromagnetic correlations on ten-spin rings, suggests a nematic order parameter, or director. We report vibrating coil magnetometry of the orientation dependence of the magnetic phase diagram of GGG down to mK temperatures, where the applied magnetic field stabilizes a complex sequences of cross-overs and phase transitions that reflect the underlying antiferromagnetic interactions.